321312653 has 2 divisors, whose sum is σ = 321312654. Its totient is φ = 321312652.

The previous prime is 321312619. The next prime is 321312661. The reversal of 321312653 is 356213123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321018889 + 293764 = 17917^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 321312653 - 2¹² = 321308557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321312253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160656326 + 160656327.

It is an arithmetic number, because the mean of its divisors is an integer number (160656327).

Almost surely, 2^321312653 is an apocalyptic number.

It is an amenable number.

321312653 is a deficient number, since it is larger than the sum of its proper divisors (1).

321312653 is an equidigital number, since it uses as much as digits as its factorization.

321312653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 26.

The square root of 321312653 is about 17925.1960379796. The cubic root of 321312653 is about 684.9243548698.

Adding to 321312653 its reverse (356213123), we get a palindrome (677525776).

The spelling of 321312653 in words is "three hundred twenty-one million, three hundred twelve thousand, six hundred fifty-three".